auto save

捐书.py

+with open (r'c:\Users\10839\Desktop\test.txt','w',encoding='utf-8') as file:
+with open (r'c:\Users\10839\Desktop\test.txt','w',encoding='utf-8') as file:
+    file.write('小兰：12本\n小强：15本\n李明：10本\n')
+with open (r'c:\Users\10839\Desktop\test.txt','a',encoding='utf-8') as file:
+    file.write('小王：16本\n')
+with open (r'c:\Users\10839\Desktop\test.txt','r',encoding='utf-8') as file:
+    a=file.read()
+    #print(a)
+with open (r'c:\Users\10839\Desktop\test.txt','r',encoding='utf-8') as file:
+    new_data=''
+    for data in file:
+        if '小王：16本' in data:
+            data=data.replace('小王：16本','小王：50本')
+        new_data=new_data+data
+    print(new_data)
+        
+            
+
+
+